DarrenF
Well-known member
Working my way through a big pile of Williams boards of all stripes.
Currently have a Stargate (only, no REV on PCB) board on the bench. I've traced the issue to the decoder PROMs, as swapping in a pair from another working (no REV Stargate only) PCB fixes it. Of course, I don't have a spare pair of decoder PROMS. I found the website with the details on how to use 2732 EPROMs in place of the OEM PROMs. However, my problem is: on both sets of decoder PROMs I've got (on these two PCBs), the labels are illegible... Need to know the correct decoder numbers for this PCB. I found a couple of pics online, and it appears to be 4 & 5 (vice 4 & 6 that Joust & Robotron, Rev B/C/D, CPU boards have).
Is this correct? Does it matter? (and for bonus points, what are the differences between the various decoder PROMs?)
Currently have a Stargate (only, no REV on PCB) board on the bench. I've traced the issue to the decoder PROMs, as swapping in a pair from another working (no REV Stargate only) PCB fixes it. Of course, I don't have a spare pair of decoder PROMS. I found the website with the details on how to use 2732 EPROMs in place of the OEM PROMs. However, my problem is: on both sets of decoder PROMs I've got (on these two PCBs), the labels are illegible... Need to know the correct decoder numbers for this PCB. I found a couple of pics online, and it appears to be 4 & 5 (vice 4 & 6 that Joust & Robotron, Rev B/C/D, CPU boards have).
Is this correct? Does it matter? (and for bonus points, what are the differences between the various decoder PROMs?)
